What's a good iOS game for when I'm stuck on a long bus journey and need something mindless but fun to pass the time?

Okay, so Cash Frenzy has been a proper useful find for me on those long, boring bus journeys across Europe. You know the ones – endless fields and dodgy wifi. What I like is that there's a load of different slot games, so you don't get stuck playing the same thing over and over. Plus, it works a treat offline, which is crucial because I'm not about to eat up all my roaming data just spinning virtual wheels. I was on a bus from Prague to Berlin last month, and it totally saved me from losing the plot. It's not exactly brain-taxing, but sometimes that's exactly what you need when you're knackered after a day of exploring. Definitely recommend it for killing time on the go!